Prompt box: Example 3 var num1 = prompt("Enter a number between 1 and 12","1") var promptstring = "What is " + num1 + " times 3?" var num2 = prompt(promptstring) document.write(" You think " + num1 + " times 3 is " + num2 + " ") link

Operators (What we can do with numbers) Operator y = 5 DescriptionExampleResult + Additionx=y+2x=7 - Subtractionx=y-2x=3 * Multiplicationx=y*2x=10 / Divisionx=y/2x=2.5 % Modulus (division remainder) x=y%2x=1

Prompt box: Example 3 var num1 = parseInt(prompt("Enter a number","1")) var num2 = parseInt(prompt("Enter a second number","1")) document.write(" Fun with numbers ") document.write(" ") var z = num1 + num2 document.write(num1 + " + " + num2 + " = " + z) document.write(" ") z = num1 - num2 document.write(num1 + " - " + num2 + " = " + z) document.write(" ") z = num1 * num2 document.write(num1 + " * " + num2 + " = " + z) document.write(" ") z = num1 / num2 document.write(num1 + " / " + num2 + " = " + z) document.write(" ") z = num1 %num2 document.write(num1 + " % " + num2 + " = " + z) document.write(" ") link

Conditional: If branches var answer = prompt("Do you like puppies?") if (answer == "yes") { document.write(" Me too! I love puppies, especially puppy bellies! ") } link

Conditional: If /else branches var age = parseInt(prompt("What is your age?")) if (age >= 21) { document.write(" Woo Woo. You're over " + age + " so you can drink legally. ") } else { document.write(" You're under " + age + " so don't even try drinking alcohol. ") } link

Comparisons: OperatorEnglishExampleResult ==Equal Tox == yfalse !=Not Equal Tox != ytrue <Less Thanx < ytrue >Greater Thanx > yfalse <= Less Than or Equal To x <= yTrue >= Greater Than or Equal To x >= yFalse  Check the relationship between values.  Note: a double equal sign (==) compares two values.  Comparison operators evaluate to either true or false. x = 3 y = 7

If – branching: var answer = prompt("what is your favorite color?") if (answer == "red") {document.write(" You are outgoing, aggressive, vigorous and impulsive! ") } else if (answer == "yellow") {document.write(" You are mentally adventurous, searching for novelty and self-fulfillment ") } else if (answer == "green") {document.write(" You are frank, community-minded, fairly sociable but prefer peace ") } else if (answer == "blue") {document.write(" You are soft, soothing, compassionate and caring ") } else if (answer == "purple") {document.write(" You are highly individual, witty and sensitive, with a strong desire to be unique ") } else if (answer == "orange") {document.write(" You are flamboyant and fun-loving and like a lively social life ") } document.write(" Thanks for playing! ")

More branching Calculate Your Grade var tests = parseInt(prompt("Exam grade?")) var labs = parseInt(prompt("Lab grade?")) var total = tests + labs / 100 if (total >= 90) {document.write(" You get an 'A' ") } else if (total >= 80) {document.write(" You get a 'B' ") } else if (total >= 70) {document.write(" You get a 'C' ") } else if (total >= 60) {document.write(" You get a 'D' ") } else {document.write(" You fail. ") } document.write(" Have a nice summer. ") link

If branching Do you need a coat in Europe? var ctemp = parseInt(prompt("What is the temperature (in Celsius?")) var ftemp = (9/5) * ctemp + 32 document.write(" The temp is " + ftemp + " ") if (ftemp > 20) {document.write(" You'll need a coat and hat ") } else if (ftemp > 45) {document.write(" You'll need a light coat ") } else if (total >60) {document.write(" You'll need a sweater ") } else if (total > 70) {document.write(" You're good without a coat ") } document.write(" Have fun!. ") link

Random Numbers JavaScript allows us to generate random numbers within a range of numbers using: randnum = Math.floor(Math.random() * range) What this does: It generates a random number between 0 and range and puts that random number in randnum

Breaking it down var randnum = Math.floor(Math.random() * 9) Math.random() generates a random number between 0 and 1 (e.g., 0.4). This number is multiplied by the range: Math.random() * 9 gives us 3.6 Math.floor(3.6) rounds down to the nearest integer. or 3 Finally, you need a variable to put all this in. I called my variable randnum, so in essence, var randnum = 3 What if you wanted a random number between 0 and 10, what would you do? What if you wanted a random number between 3 and 10? What if Math.random() generated.7? what would randnum hold?

Changing Color (Randomly) Page Colors: var randcolor = Math.floor(Math.random() * 3) if (randcolor == 0) {document.write(" This is blue ") } else if (randcolor == 1) {document.write(" This is red ") } else if (randcolor == 2) {document.write(" This is green ") } link

Using Random numbers: Heads or Tails? var ans = prompt("Heads or Tails?") if (ans == "Heads") {var numans = 0 } else if (ans == "Tails") {var numans = 1 } var compguess = Math.floor(Math.random() * 2) if (compguess == 0) {var compans = "Heads" } else {var compans = "Tails" } if (numans == compguess) {document.write(" You guessed correctly! You both guessed " + ans + "! ") } else {document.write(" You guessed incorrectly. You guessed " + ans + " and the computer guessed " + compans + ". ") } document.write(" Have fun!. ") link

Magic 8 Ball Magic 8 Ball Ask your question and the magic 8 ball will predict your answer! var ans = prompt("What do you wish to ask the magic 8 ball?") var randnum = Math.floor(Math.random() * 8) if (randnum == 0) {document.write(" There is no chance this will happen. ") } else if (randnum == 1) {document.write(" It is highly unlikely! ") } else if (randnum == 2) {document.write(" Probably not, but you never know. ") } else if (randnum == 3) {document.write(" Maybe. Maybe not. ") } else if (randnum == 4) {document.write(" This may happen if you are lucky. ") } else if (randnum == 5) {document.write(" Your chances are good. ") } else if (randnum == 6) {document.write(" This will almost certainly happen. ") } else if (randnum == 7) {document.write(" Definitely. ") } document.write(" Thank you for consulting the magic 8 ball! ") link

My Nike App Nike App var ans = prompt("How far did you run?") if (ans >= 6) {var x = Math.floor(Math.random() * 3) if (x == 0) {document.write(" Way to go with the long distances! ") } else if (x == 1) {document.write(" You're showing strong endurance! ") } else if (x == 2) {document.write(" Those distances are impressive! Keep it up! ") } else { var y = Math.floor(Math.random() * 4) if (y == 0) {document.write(" Those short runs help you build for the longer ones! ") } else if (y == 1) {document.write(" Good hustle! ") } else if (y == 2) {document.write(" Even short runs are better than sitting on the couch! ") } else if (y == 3) {document.write(" Keep running! That's what counts! ") } document.write(" Thank you for consulting the magic 8 ball! ") link